Carburetor



April 5 1927.

1,623,347 E.V H. KELLEY ET A1.A y

CARBURETOR Filed NOV. 3, 1924 cally, said passage nected with each otheras shown, and one of these 'sections inay well carry a fuel bowl 4cPanarea Apr. 5,1927.'

y g isaiasi? autres srzarjeis earjenrerriea.

EAEL H. KELLEY, HUGO E. ,GEEIWE AND FRED E. Hosmmor PETLAND, OREGON.

oARB-UEETOR.

Application ledpNovemberS, 1924s Serial No. 747,612.

'Our invention aims to provide a simple and inexpensive, yet anefficient-and reliable carburetor which is provided with improved meansfor automatically controlling the mixing of air and fuel, in thepropel-.proportions t all engine speeds.

With tl e foregoing in view, the" invention resides in the novelsubjectmatter liereiny after described anvd claimed, the description`being supplemented by the? accompanying drawing, 'l

. Figure v1 is a'vertical sectional view showing therelation vof partswhen the motor is idling or running at a relatively low`sp`eed. Figure 2is a detail sectional view similar to a portion of Fig. 1, illustratingthe relation of partsvwhen the motor is operating ata comparatively highspeed; n

Y, ln the drawing above 'briefly described,

i the preferred form kof construction has been,A

illustrated and this construction is hereinafter rather specificallydescribed, with the' understanding however that within the scope of theinvention as claimed, numerous modi ,-iieations may be made.

The numeral -1 designates a main air pasa sage whose major'portion isdisposed vertihaving tl'ieusual choke 2 at its inlet end, and a throttlevalvev 3 at its delivery end. This main air passage may well be formedof sect-ions detachably conliaving a fuel. inlet 5 controlled by anappropriate valve 6, which valve is in turn controlled .by asuitablymounted float 7 i in the bowl 4.

A relatiyely small, hollow-walled passage member 8 is verticallydisposed at the center of the passage 1, 'the hollow wall of said member8 forming" affuel reservoir 9, to which fuel,l is supplied from) thebowl 4f, through ports 10 and 11 and an appropriate casing 12 which isadapted' to contain a strainer (not shown). The lrelatively smallpassage 8 isjnternally niodeledafter a Ven,- turi tube, and at itscontracted portion is provided with a plurality o't`\fuel feeding ports13 which lead fuel reservoir 9. Also leadii' g, from they res,-

-ervoir\9 to the main air passage 1, at the exterior of the passagemember 8, are a pluy ral'ity of additionalports 111, the upperJ endportion of the member 8 being by preference externally beveled as at 15,across vthe outer ends of said ports 111.

vports for inixiugfwilh the air.

-to its interior from theI .A sliduable yvalve 16 engages the inner sideof tlie passage. 1,"said valve bei-ng of annular form and having acomparatively small internal diameter 17 at`its upper end, acomparatively large internal diameter 18 at its lower` end,`and a,downwardly facing continuous shoulder 19` whichl joins the two portions17 and 18 of different diameters.` This shoulder vnormally rests on theupper 'end 'of the passage member 8, above the ports 141', that is itrests. in this manner when the engine is idle. it also assumes the sameposition when the inotor is operating at comparatively low speeds. Then,direct passage offraii takes place through the passagev member 8 butcannot take place around this passage member, from the inlet tothedelivery" end of the passage member 1. By the'suction of the motor,however, some air travels through the-,ports 14 into the fuel reser voir9, ,here mixes with the fuel, and disn charges .4 with the latterthrough the ports 13, into the current of air passing through the passage member 8. 1A thorough mixture of fuel land air is thus provided,which will permitefective operation of themotor atm.

relatively ,low speeds. When the motor is run a little more rapidly, theincreased suction through the carburetor will raise the valve- 16',permitting passage' of air around L the passage member 8 so that theinflow of of air through the ports-14 ceases. Upon still fasterope-ration of the inotor,thel valve 16 raises until it strikes a stopshoulder 2O iii the passage member 1. `When' 4this takes place` an`internal bevel 21 at the lower eX- .treinity ofthe skirt-like lowerportion of the valve 16, is positioned to'direct an inward blast of airacross the beveled end 15 of the passage member '8, as seen in Fig. 2,This blast of air, in passing across the outer ends of the ports 14.draws fuel through these `the passage member 1, connecting it with thewall' (if said passage member by webs 28, at least one of which ishollow so that its interior constitutes the port 10. A vertical tube 21is received within the wall Q2 aud is provided with an enlarged head 25at its lower It will thus ies end, between which and miauw-@1122, a

'gasket 26. is interposed.` A ring 427 is preferably threaded on theupper end of the tube 24 to yprovide `a seat for the valve 16, sald ringbeing in abutting relation with vthe upper edgeof the wall`22'. The'ports 1li1 "may well be formed through this r1ng 27,

and the upper side of said ring is preferably (declined at 28 tothe tube24 to` assist in returning an surplus fuel to said tube. The upperend othe valve`16 is also preferably declined inwardly' as indicated at 29,.for

. the same' purpose.

' By providing the construction shown .and

described or' asubstantial equivalent thereof,

a carburetor is produced which will 'be simple and inexpensive, yet willbe highly vefficient and desirable.. As .excellent .results areobtainable from the details disclosed,

they are preferably followed, but Within the scope of the invention asclaimed, numerous modifications 'may bemade.

It maybe ladded that the term portage,

herein used, is to be construed as meaning either a single port or apluralityof ports. We claim: b I l. carburetor comprislng a`-ma1n air.passage a relatively'small air passage disposed lin said main-airpassage, said small air passage having a hollowwall providing `Aa fuelchamber, said hollow .wall having fuel1 feeding portage leading to itsinner side fromthe fuel chamber andaflso Jhaving adpassage/past saidadditional tively high` engine speeds.-

2. A structure as specified in claim l; embodying means for directing'ablast of 'air fromthe vditional portage leading from said :fuel chambertothe main air passage, and .portcontrollingmea'ns forclosing the main"air passage, said `means being disposed aboutl 'the` small airpassage on.the engine side of said additional portageat low engine,v speeds to.permit said additional portage to then communicate with the inlet 'gendof said main air passage for the purpose of `supplying air to the'aforesaid fuel chamber said port-controllingA means being mounted formovement to another -position for Aallowing low of air through the mainair portage at relasaid port-controlling means passage and at low enginespeeds.engaging the wall of the small air passage to vprevent directtravel of air from one end' offsaid main air passage to the other endthereof through the space between the two passage walls. n 4L.A Acarburetor comprising amain air passage, a relatively small air passage'mounted therein. in spaced relation to the wall thereof to permit air tol pass between the` walls ofthe two passages, said small paschamber,said hollow wallrlaving fuelv feeding portage leading to its inner sidefrom said fuel 'chamber and .alsof .having additional portage leadingfrom said fuel chainber to the main air passage, the upper end of sagehaving a hollowwall providing al fuel said hollow wall being externallybeveled across the outer. endsof said additional p'ortage; and .anannular valve slidable m-said main air passage, said valve having `asmall internal diameter atits upper portion and Aa relatively `largeinternal diameter at its r lower portion, providing a downwardly fac--ingshoulder between said end portions and a skirt-like portion" belowsaid sl-ioulder;

said shoulder resting on the wall of said small air passage above-'theaforesaid additional portage at-low engine speeds,'said` skirt-likeVportion being outwardly spaced internally beveled lower endadaptedto-di--r rect a blast o f air across the externally bevel` ed endof said wall of the smallair passage when the valve is moved upwardlya-tv relatively high engine speeds.v

In` testimonywhereof we' have hereunto aflixed our signatures.

.EARL HKELLEY.

HUGO-F1 GREIWE, FRED E. HosKIN.

'9o from said small air passage and having ain f f

